Misleading validation error

[kittaakos]

I do not know if this is an actual LS problem, but I find the error message not so helpful, and I think it should work.

void setup() {
  Serial.begin(9600);
  digitalWrite(LED_BUILTIN, HIGH); 
}

int n = 0;
void loop() {
    Serial.println("This is a test" + n++);
    Serial.write(98);
    delay(2000);
}

I get this error message:

[kittaakos]

I have just noticed the backend log:

root ERROR Arduino: 2019/11/28 14:08:45 jsonrpc2 handler: notification "textDocument/didChange" handling error: jsonrpc2: connection is closed

root ERROR Arduino: 2019/11/28 14:08:46 jsonrpc2 handler: notification "textDocument/didSave" handling error: jsonrpc2: connection is closed

root ERROR Arduino: 2019/11/28 14:08:46 jsonrpc2 handler: notification "workspace/didChangeWatchedFiles" handling error: jsonrpc2: connection is closed

root ERROR Arduino: 2019/11/28 14:09:00 jsonrpc2 handler: notification "textDocument/didChange" handling error: jsonrpc2: connection is closed

root ERROR Arduino: 2019/11/28 14:09:00 jsonrpc2 handler: notification "textDocument/didChange" handling error: jsonrpc2: connection is closed

root ERROR Arduino: 2019/11/28 14:09:00 jsonrpc2 handler: notification "textDocument/didSave" handling error: jsonrpc2: connection is closed

root ERROR Arduino: 2019/11/28 14:09:01 jsonrpc2 handler: notification "workspace/didChangeWatchedFiles" handling error: jsonrpc2: connection is closed

root ERROR Arduino: 2019/11/28 14:09:01 jsonrpc2 handler: notification "workspace/didChangeWatchedFiles" handling error: jsonrpc2: connection is close

It is the same as #17. I am closing it.